Mechanical lettering device.



J. E. ROBBI'NS. MECHANICAL LBTTEBING DEVICE.

APPLIUATIDN. FILED FEB. 5`, 1910.

Patented Aug-16, 1910.

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JAMES EL ,ROBBIN OF" NEBRSKA CITY; NEBRASKA;

u MECHANICAL" LETTERING DEVICE.

Sixecaton of Letters Patent.

Patented Aug. 16,19102 Application flied rebruaryaieio. serial no.542,325.

To @ZZ 'whom it may ,concerns Be it known thatLJAMns E. RoBBINs, acitizen of the United States, residing :at Nebraska City, in the countyof Otoe and State of Nebraska, have invented certain new and usefulImprovements in Mechanical Lettering Devices, of which the following isa specification. p i

My invention is a mechanical lettering device which may be used inmaking accurately any size and style of letters.

In the accompanying` drawings: Figure 'l is a face view of myinvention.Figs. 2, 3 and et are diagrams showing how the invention may be used.

My invention is described as follows.

My device consists of a carpenters square, the left hand edge of thebeam being divided into inches and parts of inches and numbered; thecenter of its beam is provided with a vertical row of perfora-tions 9,of an inch apart. Every alternate perforation is numbered, thus,beginning at the upper end of the square, the iirst perforation isopposite the inch mark, the second is opposite the inch mark and isnumbered 1, the third perforation is opposite the l; inch mark and isnumbered 2, the fifth one is opposite the inch mark and is numbered 3and so on down to 11, numbering every alternate perforation inconsecutive order.

In the upper left hand corner of the square is a slot a, its left handend being half way distant between the second and third quarter marks ofthe beam of the square and its right hand end resting on the first inchmark of the blade of the square, and about down from the right hand endof said slot is a small recess Z). This slot stands at an incline of 30degrees in relation to the lower edge of the blade. Said blade isprovided with two slots c and c', the first standing at an incline of 70and the other 60 degrees in relation to the lower edge of the blade,both leaning to the right. rIhe eX-` treme righthand end of said bladeis provided with two slots cl and d respectively; the first standing atan incline of 60 and the other at 70 degrees to the lower edge of theblade, both leaning to the left. Said slots a, c, c', CZ, and cl havedrawn longitudinally through their centers and running to the edges ofsaid square, lines 7", r', r2, 9^ and r4, respectively, so thatthedesired angles may be made byplacing a `pencil mark at each end of saidlines instead` of using the slots,`

Alittle study would i quickly show` how this device is used.` Place'this. device down on the sheet, on which` the lettering or drawings areto be made, the right angle corner to the leftand draw a vertical linewith the left hand edge of the square and a line with the blade orrightangle edge and run a line through the slot a to get an angle lineof 30 degrees to the left at the corner,

and by turning: the square over theright angle part lto the right to getla similarl an gle e and so on `at every corner of the large figuremarked F ig. 2.

If I desire to make a circle 5 inches in diameter, I place my pivot inthe perforation immediately opposite inch l, and my pencil in theperforation immediately opposite 3112; inches and describe a circle withits center at the point indicated at f, Fig. 3, and thus I get a perfectcircle 5 inches in diameter indicated at g. If I want to draw the are ofa circle 925 inches in diameter, I place my pivot through theperforation immediately opposite inch l and my pencil. through theperforation immediately opposite and draw my ellipse as indicated by theelliptical line marked z' and to draw a similar are opposite the arcjust made, I place my pivot at j immediately through the perforationmarked l, and my pencil through the perforation at 55j-, and I form theshort arcs le and Z in the same way.

It will be seen by using this device that I can, without the aid ofdividers, accurately draw any size circle or any arc of a circle. Itwill be observed that if I place the blade of the square on the baseline m and draw a line `through the slot c, I will get a line a at anangle of 70 degrees from said base line, and if I slip the square to theright and perform the same operation I get a similar line of 70 degreesas at o and if I reverse the rule and draw a line through the same slotI get a line p at an angle of 70 degrees from said base line and if Islip the rule to the left I get a similar line g, with the sameinclination, and then if I draw a line along the lower edge of theblade, connecting the lower ends of the lines n, 0, g, and 0, I get aletter A; the two horizontal lines connecting the inclined lines o and gmay be drawn by using any one of the straight edges of my letteringdevice.

The same result may be obtained by makingA the proper dots at the endsof the lines r, 1 r2, r3 and r* and drawing the lines as indicatedabove.

Having described my invention what I claim as new and desire to secureby Letters Patent, is: A

l. A carpenters square having the left hand edge of its beam dividedinto inches and parts of inches, said inchesl being numbered from top tobottom; a line of perfora- ,tions -in the center of said beam, the upperperforation immediately opposite the threequarter inch mark, the secondperforation immediately opposite the inch mark, the perforationscontinuing` down the center of said beam at intervals of i inch andnumbered alternately l, 2, 3, and 4 and so on down to the lower end ofsaid line, said square having in its upper left hand cor-l ner a slot aat an incline of 30 degrees, from the edge of the blade, leaning to theright, the blade of said square having a slot o at an angle of 70degrees, another slot o at an angle of 60 degrees, both leaning to theright, and near the end of said blade, a slot d of 60 degrees and a slotd of 70 degrees both leaning to the left.

2. A device to aid in sign painting having a straight side or beam and aright angle blade, said beam side and right angle blade being dividedinto inches and parts of inches, a row of perforations runningvertically through beam of said device one-quarter of an inch apart andnumbered alternately l, 2, 3, et, etc., a slot a in the upper left handcorner of the device at an angle of degrees in relation to the upperstraight edge of the device, leaning to the right, slots in the blade ofsaid device leaning at different angles and in different directions fromthe base, sub stantially as shown and described.

In testimony whereof I aiiix my signature, in presence of two witnesses.

JAMES E. ROBBINS.

Witnesses F. W. Ko'r'rMANN, HARVEY TETEW.

